| /* |
| * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2012, 2021 SAP SE. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "asm/macroAssembler.inline.hpp" |
| #include "code/vtableStubs.hpp" |
| #include "interp_masm_ppc.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/compiledICHolder.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/klassVtable.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "vmreg_ppc.inline.hpp" |
| #ifdef COMPILER2 |
| #include "opto/runtime.hpp" |
| #endif |
| |
| #define __ masm-> |
| |
| #ifndef PRODUCT |
| extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index); |
| #endif |
| |
| // Used by compiler only; may use only caller saved, non-argument registers. |
| VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { |
| // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing. |
| const int stub_code_length = code_size_limit(true); |
| VtableStub* s = new(stub_code_length) VtableStub(true, vtable_index); |
| // Can be NULL if there is no free space in the code cache. |
| if (s == NULL) { |
| return NULL; |
| } |
| |
| // Count unused bytes in instruction sequences of variable size. |
| // We add them to the computed buffer size in order to avoid |
| // overflow in subsequently generated stubs. |
| address start_pc; |
| int slop_bytes = 8; // just a two-instruction safety net |
| int slop_delta = 0; |
| |
| ResourceMark rm; |
| CodeBuffer cb(s->entry_point(), stub_code_length); |
| MacroAssembler* masm = new MacroAssembler(&cb); |
| |
| #if (!defined(PRODUCT) && defined(COMPILER2)) |
| if (CountCompiledCalls) { |
| start_pc = __ pc(); |
| int load_const_maxLen = 5*BytesPerInstWord; // load_const generates 5 instructions. Assume that as max size for laod_const_optimized |
| int offs = __ load_const_optimized(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr(), R12_scratch2, true); |
| slop_delta = load_const_maxLen - (__ pc() - start_pc); |
| slop_bytes += slop_delta; |
| assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); |
| __ ld(R12_scratch2, offs, R11_scratch1); |
| __ addi(R12_scratch2, R12_scratch2, 1); |
| __ std(R12_scratch2, offs, R11_scratch1); |
| } |
| #endif |
| |
| assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1"); |
| |
| const Register rcvr_klass = R11_scratch1; |
| address npe_addr = __ pc(); // npe = null pointer exception |
| // check if we must do an explicit check (implicit checks disabled, offset too large). |
| __ null_check(R3, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL); |
| // Get receiver klass. |
| __ load_klass(rcvr_klass, R3); |
| |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| Label L; |
| // Check offset vs vtable length. |
| const Register vtable_len = R12_scratch2; |
| __ lwz(vtable_len, in_bytes(Klass::vtable_length_offset()), rcvr_klass); |
| __ cmpwi(CCR0, vtable_len, vtable_index*vtableEntry::size()); |
| __ bge(CCR0, L); |
| __ li(R12_scratch2, vtable_index); |
| __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), R3_ARG1, R12_scratch2, false); |
| __ bind(L); |
| } |
| #endif |
| |
| int entry_offset = in_bytes(Klass::vtable_start_offset()) + |
| vtable_index*vtableEntry::size_in_bytes(); |
| int v_off = entry_offset + vtableEntry::method_offset_in_bytes(); |
| |
| __ ld(R19_method, (RegisterOrConstant)v_off, rcvr_klass); |
| |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| Label L; |
| __ cmpdi(CCR0, R19_method, 0); |
| __ bne(CCR0, L); |
| __ stop("Vtable entry is ZERO", 102); |
| __ bind(L); |
| } |
| #endif |
| |
| address ame_addr = __ pc(); // ame = abstract method error |
| // if the vtable entry is null, the method is abstract |
| // NOTE: for vtable dispatches, the vtable entry will never be null. |
| |
| __ null_check(R19_method, in_bytes(Method::from_compiled_offset()), /*implicit only*/NULL); |
| __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method); |
| __ mtctr(R12_scratch2); |
| __ bctr(); |
| |
| masm->flush(); |
| bookkeeping(masm, tty, s, npe_addr, ame_addr, true, vtable_index, slop_bytes, 0); |
| |
| return s; |
| } |
| |
| VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
| // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing. |
| const int stub_code_length = code_size_limit(false); |
| VtableStub* s = new(stub_code_length) VtableStub(false, itable_index); |
| // Can be NULL if there is no free space in the code cache. |
| if (s == NULL) { |
| return NULL; |
| } |
| |
| // Count unused bytes in instruction sequences of variable size. |
| // We add them to the computed buffer size in order to avoid |
| // overflow in subsequently generated stubs. |
| address start_pc; |
| int slop_bytes = 8; // just a two-instruction safety net |
| int slop_delta = 0; |
| |
| ResourceMark rm; |
| CodeBuffer cb(s->entry_point(), stub_code_length); |
| MacroAssembler* masm = new MacroAssembler(&cb); |
| int load_const_maxLen = 5*BytesPerInstWord; // load_const generates 5 instructions. Assume that as max size for laod_const_optimized |
| |
| #if (!defined(PRODUCT) && defined(COMPILER2)) |
| if (CountCompiledCalls) { |
| start_pc = __ pc(); |
| int offs = __ load_const_optimized(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr(), R12_scratch2, true); |
| slop_delta = load_const_maxLen - (__ pc() - start_pc); |
| slop_bytes += slop_delta; |
| assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); |
| __ ld(R12_scratch2, offs, R11_scratch1); |
| __ addi(R12_scratch2, R12_scratch2, 1); |
| __ std(R12_scratch2, offs, R11_scratch1); |
| } |
| #endif |
| |
| assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1"); |
| |
| // Entry arguments: |
| // R19_method: Interface |
| // R3_ARG1: Receiver |
| |
| Label L_no_such_interface; |
| const Register rcvr_klass = R11_scratch1, |
| interface = R12_scratch2, |
| tmp1 = R21_tmp1, |
| tmp2 = R22_tmp2; |
| |
| address npe_addr = __ pc(); // npe = null pointer exception |
| __ null_check(R3_ARG1, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL); |
| __ load_klass(rcvr_klass, R3_ARG1); |
| |
| // Receiver subtype check against REFC. |
| __ ld(interface, CompiledICHolder::holder_klass_offset(), R19_method); |
| __ lookup_interface_method(rcvr_klass, interface, noreg, |
| R0, tmp1, tmp2, |
| L_no_such_interface, /*return_method=*/ false); |
| |
| // Get Method* and entrypoint for compiler |
| __ ld(interface, CompiledICHolder::holder_metadata_offset(), R19_method); |
| __ lookup_interface_method(rcvr_klass, interface, itable_index, |
| R19_method, tmp1, tmp2, |
| L_no_such_interface, /*return_method=*/ true); |
| |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| Label ok; |
| __ cmpd(CCR0, R19_method, 0); |
| __ bne(CCR0, ok); |
| __ stop("method is null", 103); |
| __ bind(ok); |
| } |
| #endif |
| |
| // If the vtable entry is null, the method is abstract. |
| address ame_addr = __ pc(); // ame = abstract method error |
| |
| // Must do an explicit check if implicit checks are disabled. |
| __ null_check(R19_method, in_bytes(Method::from_compiled_offset()), &L_no_such_interface); |
| __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method); |
| __ mtctr(R12_scratch2); |
| __ bctr(); |
| |
| // Handle IncompatibleClassChangeError in itable stubs. |
| // More detailed error message. |
| // We force resolving of the call site by jumping to the "handle |
| // wrong method" stub, and so let the interpreter runtime do all the |
| // dirty work. |
| __ bind(L_no_such_interface); |
| start_pc = __ pc(); |
| __ load_const_optimized(R11_scratch1, SharedRuntime::get_handle_wrong_method_stub(), R12_scratch2); |
| slop_delta = load_const_maxLen - (__ pc() - start_pc); |
| slop_bytes += slop_delta; |
| assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); |
| __ mtctr(R11_scratch1); |
| __ bctr(); |
| |
| masm->flush(); |
| bookkeeping(masm, tty, s, npe_addr, ame_addr, false, itable_index, slop_bytes, 0); |
| |
| return s; |
| } |
| |
| int VtableStub::pd_code_alignment() { |
| // Power cache line size is 128 bytes, but we want to limit alignment loss. |
| const unsigned int icache_line_size = 32; |
| return icache_line_size; |
| } |